Question & Answer: You dilute 20.00 ml of a stock solution of H_2SO_4 to 1.00 L. You then make duplicate…..

You dilute 20.00 ml of a stock solution of H_2SO_4 to 1.00 L. You then make duplicate titrations of 20.00 ml each of the diluted H_2SO_4 solution with your 0.202 M NaOH(aq) solution to the phenolphthalein end point. Titration 1 requires 39.05 ml: titration 2 requires 39.09 ml. Calculate the concentration of the stock H_2SO_4 solution (3 sig fig).